var longTable = make(map[string]DBStruct)

func LoadFromDB(db) {
   rows, err := db.Query("SELECT * FROM 4millionrowTable")
   for rows.Next() {
        st := DBStruct{}
        rows.Scan(
           &st.FieldOne,
           &st.FieldTwo, //  until Field14
       )
       longTable[st.FieldOne + ":" + st.FieldTwo] = st
   }
}